Well I guess it depends on what you want to use it for. Concealed carry the sub compact or compact models would be best. Target and competition shooting you're gonna want a full size for its longer barrel. Compensated models are a mix with some people, me personally I don't care for them because if I have to use it in a dark setting the flash can blind you and make target acquisition much more difficult if multiple shots are needed for a defensive situation. But the compensated models are pretty good for target shooting because a .45 has a pretty good kick and it helps lesson the muzzle lift.
I think all 3 would carry nice with the right holster and belt.. The 36 is a single stack so your giving up a few rounds in the mags. If I were to buy a .45 it would be the 30 just because it's identical to my 29.